====== Right triangle ======

<WRAP important round>
See the general [[courses:be5b33prg:tutorials:homeworks|homework guidelines]]!
</WRAP>

Create a text file ''triangle.py''. In it, define function ''is_right(a, b, c)'' which
  * accepts 3 natural numbers (positive integers) representing the side lengths of a triangle, and  
  * checks whether the triangle is right, i.e. the function
    * returns ''True'' when the numbers ''a'', ''b'', ''c'' represent side lengths of a right triangle, and 
    * returns ''False'' otherwise.
Assume that you will always get 3 positive integers as arguments. But DO NOT ASSUME that you will get them in any specific order!

===== Grading: =====
  * 3 points for automatic checks
  * 1 point for manual evaluation (is the code readable)